Which? Reveals the UK's Top and Bottom Energy Suppliers: A Consumer Guide (2026)

Unveiling the UK's Energy Providers: A Deep Dive into Which?'s Annual Rankings

The UK's energy providers are under the spotlight, with Which? revealing the best and worst performers in its annual rankings. But here's where it gets controversial: while some suppliers are excelling, others are falling short, leaving customers with subpar service and value for money.

The consumer group's survey, which assessed nearly 12,000 energy customers and delved into the behind-the-scenes practices of 17 firms, has uncovered a mixed bag of results. Scottish Power, EDF, and British Gas have been named as the worst performers, with overall scores of less than 60% and just two stars in the customer survey.

Scottish Power, in particular, received the lowest overall score of 56%, with its handling of complaints being the lowest-scoring area. EDF came second to last with 58%, largely due to its phone lines and customer service email accounts not being monitored for as long as other providers. British Gas, meanwhile, struggled with resolving complaints and switching customers, despite offering a 'good amount' of support.

On the other hand, E (Gas and Electricity) received the highest overall score of 79%, with four stars for customer service, ease of contacting, and clarity of statements. Nearly nine in 10 E customers (86%) said they would recommend the provider.

Octopus Energy, 100Green, and Sainsbury’s Energy followed closely behind, with scores of 74%, 72%, and 71%, respectively. Co-op Energy and Outfox Energy received the same overall score as Sainsbury’s Energy but did not score three stars or higher in every category of the customer survey.

Which? Energy editor Emily Seymour commented, 'Our research shows that while four suppliers are outshining the competition, some big firms – including Scottish Power, EDF, and British Gas – are letting their customers down. With fixed tariffs now reliably cheaper than the energy price cap, there is no need for customers to put up with poor value for money or shoddy customer service. Any suppliers falling short need to improve or their customers will vote with their feet.'

But here's where it gets thought-provoking: while some suppliers are making strides, others are struggling to keep up. It's up to the customers to decide whether the improvements are enough. So, what do you think? Are you happy with your current energy provider? Or are you ready to switch to a supplier with better value and service? Share your thoughts in the comments below!

Which? Reveals the UK's Top and Bottom Energy Suppliers: A Consumer Guide (2026)
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